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Free CLEP Science and Mathematics Exam Braindumps (page: 44)

Page 43 of 128
PDF with 494 Questions

Which of the following has the largest bond energy?

  1. F ­ F
  2. C = C
  3. I ­ I
  4. N = N
  5. O = O

Answer(s): D

Explanation:

Triple bonds are inherently stronger than single or double bonds, and would require the most energy to cleave.



What is the density of hydrogen gas at 25° C and 4 atm pressure? (R = 0.082 L × atm × mol-1 × K-1)

  1. 0.002 g/L
  2. 0.08 g/L
  3. 0.33 g/L
  4. 1.38 g/L
  5. 2.98 g/L

Answer(s): C

Explanation:

Density = mass / volume and PV - nRT. Substituting V = nRT/P into the density expression, we get density - mass (P/ (nRT). Molecular weight (MW) is simply mass / n, so density - (MW × P) / (RT), which equals 0.33 g/L.



A chlorinc-37 nucleus contains how many protons and how many neutrons? (Protons, Neutrons)

  1. 17, 37
  2. 17, 20
  3. 37, 20
  4. 37, 17
  5. 20, 17

Answer(s): B

Explanation:

Chlorinc-37 has an atomic number of 17 and a mass number of 37. The number of protons corresponds to the atomic

number and the number of neutrons is the difference between the atomic number and the mass number.



Which of the following has the lowest ionization energy?

  1. Li
  2. Na
  3. K
  4. F
  5. Ne

Answer(s): C

Explanation:

Ionization is a measurement of the energy necessary to remove an electron from an atom. Ionization energy increases going across the periodic table from left to right, and going up a column. Neither F nor Ne would want to lose electrons (F wants to gain electrons and Ne already has a noble electron configuration) and would have very large ionization energies. Going down group 1A the ionization energy decreases from Li to Na to K.






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